I bought my house in Feb and new about the water, there is a small damp patch at the top of the wall, and its coming down the recess.
I had a roofer out twice, and he said it definetly isnt the roof. Then he noticed the render was all coming off the walls outside and said the water was probably travelling through there.
So, I had all the rendering done a few weeks ago. This morning (after heavy rain last night) I noticed the wet patch is bigger and it hasnt dried out.
I don't know who to call or what it could be...